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Corydalis flexuosa AGM

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© RHS 1999

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Blue in Spring and Summer

Foliage

Blue, Green and Purple in Spring

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

blue corydalis

Family

Papaveraceae


Corydalis can be annuals, biennials or tuberous or rhizomatous perennials, with ternately or pinnately lobed leaves and racemes of spurred, tubular flowers

C. flexuosa is an herbaceous perennial to 30cm in height, dying down in summer, with divided glaucous leaves, sometimes tinged purple, and clusters of two-lipped blue flowers with white throats in spring and early summer

How to grow

Sunlight

  • Part shade

Aspect

  • South-facing, West-facing or East-facing
  • Exposed or Sheltered

Cultivation

Grow in moderately fertile, humus-rich soil

Soil

  • Moist but well-drained
  • Acid, Alkaline or Neutral
  • Sand, Clay, Chalk or Loam

Propagation

Propagate by seed sown in containers in an open frame when ripe or by division in autumn

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Rock Garden, Underplanting of Roses and Shrubs or Wildflower meadow


How to care

Pruning

No pruning required

Pests

Slugs and snails may be a problem

Diseases

Generally disease free